Spark-plug



H. B. VESSEY.

SPARK PLUG.

APPLicATxoN FILED sEPT.25.191s.

Patented Oct. 12, 1920.

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rovements in Spark-Plugs, of whichthe ollowing is al specification.

The invention relates to improvements tion and method'o forming the lug whereby the electrode suxported yby lt e msulator, is properly sealed creto and the insulator itself properly sealed in theshell of the plu inan expeditious manner and with a fu measure of safety against fracture or breakage of the insulator orfany loose )mnt 1n the sealing of the same about both the electrode and shell. r

These and other objects will appear from the followi description talren lnconnection with t e acoompanymw drawings,

which form a part of this specification andy mfvhlh r' 1 .el

nte ramng,41gure 1s ave ca sectional view of the spark plug parte before s ealin showin the same supported on a sutab e base. view showing the a plication of the tool for sealing the electrode and seati11g the msulator within the shell, and Fig. 3 is avertical sectional view showing the tool sealing the electrode inthe insulator and premg the insulator with -said'` electrode firmly onto the sket within the shell, and the tool for sealing said shell about the insulator. Like numerals of reference indicate snmlar parts throughout the views.

Referring to the drawing, particularly Fia. 1, 10 is a base or table havin a sultable orifice 11 therein and in w ich the lower end of the shell 12 is inserted, said shell bein of any desired former structure as desire and having the interior bore 18 formed with the seating flange 14 and the upwardl extending top seallng iange 15.

The s ell 12 when in the position clescribed, has placed therein an insulator member 16 having the enlarged center portion 17, below which is arranged a comressible gasket 18, said gasket seating upon t e flange 14 of the shell.

Spann-ienne.

specification or :emu man. `Applicants meu eebtember as. 191s; seran no. amm.

. and a compressible ign 2 is a vertical `sectional- 'hereinbefore referred to.

. Patented oet. V1a, 1920.

The insulator 16 also has a 'central electrode 19 arranged therein and extending downwardly therethrough, as customary in spark plug construction.

The electrode 19 adjacent the :u per end thereof has a flange 20 extendingllaterally therefrom immediatelyV above the insulator,

casket 21 formed of asbestos or other suitahle'material is arranged between said iange20 and the top ofthe insulator 16.` y

A suitable gasket22 is placed about the insulator immediately above the enlarged center portion l-' in readiness 4to orm a seal when the upwardly extending an'ge 15 A of the shell is turned thereover, as hereinafter described Y V Referring particularly to Fig. 2 the parte as. shown and described with relerence to and the insulator. l Y

Coincidentally with the sealing of the `Ilange 20 against the insulator, the tool 23,

pressing as it does on the top of the insulator, will seat said insulator very firmly within the shell, and in so doing compress the asket 18 onto the Bange-14 to form a gas-tight joint therebetween.

Re erring particularly to Fig. 3, the parts as shown and described with reference to Fig. 2 are now ready for the next operation of sealin which comprises the use of a ,cylindrica tool 26. havmg a center bore 27 whereby it may he brought downwardly over the tool 23, the lower end of said tool 4being suitably formed as at 28 to turn the upwardly extending flange 15 of the shell inwardly over the enlarged center rtion 17 of the insulator, or against any gas et which may be about the insulator at that part, as As e. result of this sealin operation the inturned ila 15 of the she as shown in Fi 3, will e ectuelly retain the center insula rin its proper position within the shell, wherein it is lirinl pressed against the lower sealing gasket 1 It will of course be obvious -to those skilled in the art that many forms of gaskets or sealin materiel may be used nt the joints desires? to be sealed, or if the sun faces are properly preelared the gaskets may be eliminated entir y, or if desired, a suitable coating of material such as a varnish of lither e or bakelite in liquid form me be plac upon the surfaces where the Sealing action is to occur, end the method of forming the spnrk plug :is herein described carried out, the essential features of which are the, means whereby the electrode may be roperly set and sealed inthe insulator sind coincidentally therewith `the insulator itself properly sented in the shell, at which time .the upper flan e portion of the shell, or any other suitaba means such as a threaded nut or bushing, is so positioned as to hold the insulator with the central electrode sealed therein. in its proper sealed position* within the shell.

It willbe obvious-to those skilled in the art that many modifications vend chang? may be made without departing `from t e spirit andsoope ofthe invention.

Having new described my invention what I elaiinas new and desire to secure by Letters Patent is:

1. The method of forming spark plugs .oomprisinv the seetin of the insulator with mi electrode supporte therein u on a coinpressible gasket within a Shel having a sealing flange, pnessin said electrode to ses] the same in said ator, and pressing a holding flange of said shell inward and into holding engagement with seid insulator to tlhieleby secure the same in place within said s e 2. The method of formi spark plugs comprisin the seatinjof the insulator with an electro e supporte therein upon e compressible gasket within a shell having a sealin flan and coincidentally pressing seid e ectro e to Seel the seme in seid insuletor and pressing a holding flange of said shell inward and into holding engagement with said insulator to thereby secure the seme in place within said shell.

3. The method offorming spark plu s comprising the seating of the insulator wi en electrode sup rted therein and having a flanged part a ve said insulator end a sealing gasket immediately therebeneatli upon a compressible gasket within e shell having a sealing flange, pressing upon the flange of said electrode to seal the same against said insulator, and pressi-ng a. holdin flange of said shell inward and into lio ding engagement with said insulator to thereby secure the same in place within said shell.

4. The method of forming spark plugs com risin the seatin ofthe insulator with an e ectio e sup orte( therein and hevin n 'flanged pa'rt e, ve said insulator ven a sealing gasket immediately therebeneath upon e oonipressihley gasket within s ,shell having a sealing Einige,V pressing upon the fienge of saidelectrode about the outer edge thereof to seal the same in -ssidinsuleton and ooincidentally pressing a holding-,flange of said shell inward and into holdin engagement with seid insulator to there :'f secure the same in place within said shell. 5. The method of formin spark plu comprising the arranging o an electro e within an insulator whereby it may be sealed therein und arranging said insulator within s, shell whereby it-may be sealed therein, exerting a sealing pressure u on said electrode and insulator, and provi ng said shell with a means for retaining said insulator in sealed position while the sealing pressure aforesaid -is maintained 4upon said electrode and insulator. y

In testimony whereof I eilix my signature.

RALPl-I B. VESSEY. 

